open access

https://doi.org/10.14943/lowtemsci.74.31

https://hdl.handle.net/2115/61061

Land-sea pathways between snowmelt and fishery production in Funka Bay, Japan

日本語

2016-03-31

低温科学第74巻編集委員会

Low Temperature Science

74

31-41

The annual spat density of scallop that is a typical coastal fishery in Funka Bay is highly correlated with the snowmelt runoff or accumulated snowfall. This study investigated the land-sea pathways in Funka Bay, Japan, a typical semi-enclosed bay during snowmelt period to understand how the snowmelt runoff can improve the production of cultured scallop larvae associated with ocean primary production, by analyzing hydrological and oceanic data produced by a land-sea integrated model in conjunction with newly compiled datasets of riverine nutrient concentrations. The model successfully estimated the riverine dissolved inorganic nitrogen (DIN) flux that is dominated by the temporal variation of the river runoff rather than that of the riverine DIN concentration. Ocean simulation indicated that the freshwater flux supplied by the snowmelt runoff enhances clockwise circulations along the coast of the bay. The close relationship between the annual spat density of scallop and the snowmelt runoff associated with high DIN concentrations suggested that riverine nutrients can increase the biomass of phytoplankton in near-shore seas and improve food availability for scallop spawners, resulting in increased egg production in March to April. Therefore, the nutrient flux from agricultural source areas through the large snowmelt runoff has an important role in larvae production. Land-sea pathways need to be identified to design sustainable and synergetic systems of aquaculture and agriculture for the integrated management of coastal regions

紀要論文

Version of Record

1880-7593